FLOATING SEAL is important part that prevents oil leakage during spinning at inner part of TRACK ROLLER, CARRIER ROLLER which is lower driving part for cranes. FLOATING SEAL spins with whole body of ROLLER, and the surface of FLOATING SEAL has been precision processed to minimize heat while rotating. Product Model Large sized Roller : HKT-1250AMedium sized Roller : HKT-1050A,HKT-1000A,HKT-0950A, HKT-0850ASmall sized Roller : HKT-0730A,HKT-0700A,HKT-0660A,HKT-0630A, HKT-0630B,HKT-0490A,HKT-0450A